I was messing around with Wolfram Alpha's widget creation UI and decided to try my hand at creating one. Here's a simple way to calculate engine displacement. It's pretty fun. Check it out.
We need to get Kinja in on this so we can embed these things. I bet we could have a lot of fun with this kind of stuff.
Just a heads up, there seem to be some issues that make it so it doesn't work 100% of the time. I'm assuming these issues are related to the fact that the widget builder is still in it's infancy.
Edit: Let me know if you're having issues with it. Sometimes it doesn't give the displacement in cm3.
2nd Edit: The units are supposed to be in cm. I forgot to label them.